Sorry i can seem to get the image to show up. Try this:
https://theilp.org.uk/publication/guidance-note-1-for-the-reduction-of-obtrusive-light-2021/
British Astronomical Association
Supporting amateur astronomers since 1890
Supporting amateur astronomers since 1890
Sorry i can seem to get the image to show up. Try this:
https://theilp.org.uk/publication/guidance-note-1-for-the-reduction-of-obtrusive-light-2021/